Rapallo Viaduct and the Lyman Viaduct in East Hampton and Colchester, Connecticut, which are two of the longest rail viaducts in the U.S. Trail development The abandoned rail corridor between East Hampton and the Massachusetts state line was acquired by the Connecticut State Park System with the section from Route 66 in Windham to US Route 44 in Pomfret opening to the public in 1969 as a bridle trail. In 1976, the trail designation was extended north to Town Farm Road in Putnam. The southern section from East Hampton to Willimantic was opened as a trail in 1986. The Thompson section was opened in 1992. The bridge over the Willimantic River to Bridge St. was opened in 2015, and an extension south to Portland opened in 2018. Air Line State Park Trail is divided into three sections: South section (from Middle Haddam Road in Portland to Bridge Street in Windham, with a connection to Columbia Avenue) North section (from Milk Street in Windham to Kennedy Drive in Putnam) Thompson section (from Route 12 (Riverside Drive) in Thompson to the MA state line) The North section of the trail from Windham to Putnam is part of the East Coast Greenway, which will stretch from Florida to Maine. The South and North sections are connected by the Veterans Greenway, a short town-owned rail trail on the northeast side of Willimantic, which is partially incorporated into the North section itself. The connection is not complete, as no trail connection has yet to be made through downtown Willimantic from the bridge to the Veterans Greenway. However a street connection is available joining the two sections by going onto Bridge Street for 250 feet, then turning right onto Main Street for 0.5 miles then turning left on Jackson St. for 150 feet then turning right on Union St. 50 feet. Southern extensions The trail as originally built ended next to a cranberry bog at Smith Street, east of the village center of East Hampton. The right of way remained intact and unused as far as the end of active track in Portland; some sections were used for unofficial trails with poor trail surface and frequent washouts. In 1999, a bridge over Muddy Gutter Brook west of downtown East Hampton was designed and built by cadets of the United States Coast Guard Academy under the supervision of William O'Neill, an adjunct professor of engineering at the